<!doctype html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>脑图</title>
	<style type="text/css">
	/*CSS源代码*/
* {
	margin: 0;
	padding: 0;
}

.tree ul {
	padding-top: 20px;
	position: relative;
	transition: all 0.5s;
	-webkit-transition: all 0.5s;
	-moz-transition: all 0.5s;
}

.tree li {
	float: left;
	text-align: center;
	list-style-type: none;
	position: relative;
	padding: 20px 5px 0 5px;
	transition: all 0.5s;
	-webkit-transition: all 0.5s;
	-moz-transition: all 0.5s;
}

.tree li::before, .tree li::after {
	content: '';
	position: absolute;
	top: 0;
	right: 50%;
	border-top: 1px solid #ccc;
	width: 50%;
	height: 20px;
}

.tree li::after {
	right: auto;
	left: 50%;
	border-left: 1px solid #ccc;
}

.tree li:only-child::after, .tree li:only-child::before {
	display: none;
}

.tree li:only-child {
	padding-top: 0;
}

.tree li:first-child::before, .tree li:last-child::after {
	border: 0 none;
}

.tree li:last-child::before {
	border-right: 1px solid #ccc;
	border-radius: 0 5px 0 0;
	-webkit-border-radius: 0 5px 0 0;
	-moz-border-radius: 0 5px 0 0;
}

.tree li:first-child::after {
	border-radius: 5px 0 0 0;
	-webkit-border-radius: 5px 0 0 0;
	-moz-border-radius: 5px 0 0 0;
}

.tree ul ul::before {
	content: '';
	position: absolute;
	top: 0;
	left: 50%;
	border-left: 1px solid #ccc;
	width: 0;
	height: 20px;
}

.tree li a {
	border: 1px solid #ccc;
	padding: 3px 10px 5px 10px;
	text-decoration: none;
	color: #666;
	font-family: arial, verdana, tahoma;
	font-size: 13px;
	display: inline-block;
	border-radius: 5px;
	-webkit-border-radius: 5px;
	-moz-border-radius: 5px;
	transition: all 0.5s;
	-webkit-transition: all 0.5s;
	-moz-transition: all 0.5s;
}

.tree li a:hover, .tree li a:hover + ul li a {
	background: #c8e4f8;
	color: #000;
	border: 1px solid #94a0b4;
}

.tree li a:hover + ul li::after, .tree li a:hover + ul li::before, .tree li a:hover + ul::before, .tree li a:hover + ul ul::before {
	border-color: #94a0b4;
}

.dd {
	width: 3000px;
	overflow: scroll;
	height: 700px;
}

	</style>

</head>
<body>
	<!-- HTML代码片段中请勿添加<body>标签 //-->
 

 <div class="tree">
    <ul class="first">
        <li>
        	<a href="javascript:;" onclick="addChild(this);" >组织机构</a>
        </li>
    </ul>
</div>



<!-- 推荐开源CDN来选取需引用的外部JS //-->
<script type="text/javascript" src="jquery-1.11.3.js"></script>
<script type="text/javascript">
var addChild=function(obj){
	var li='<li><a href="javascript:void(0);" onclick="addChild(this);">test</a></li>';
	if($(obj).parent().find("ul").length>0){
		$(obj).parent().children("ul").first().append(li);
	}else{
		$(obj).parent().append("<ul>"+li+"</ul>");
	}
	var widthLi = $('.tree>ul>li').width();
	var widthTree = $('.tree').width();
	if(widthTree-widthLi < 100){
		$('.tree').width($('.tree').width()+300);
	}
};
	</script>

</body>
</html>